coap_handler.c
1.85 KB
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/*
* Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fmt.h"
#include "nanocoap.h"
/* internal value that can be read/written via CoAP */
static uint8_t internal_value = 0;
static ssize_t _riot_board_handler(coap_pkt_t *pkt, uint8_t *buf, size_t len)
{
return coap_reply_simple(pkt, COAP_CODE_205, buf, len,
COAP_FORMAT_TEXT, (uint8_t*)RIOT_BOARD, strlen(RIOT_BOARD));
}
static ssize_t _riot_value_handler(coap_pkt_t *pkt, uint8_t *buf, size_t len)
{
ssize_t p = 0;
char rsp[16];
unsigned code = COAP_CODE_EMPTY;
/* read coap method type in packet */
unsigned method_flag = coap_method2flag(coap_get_code_detail(pkt));
switch(method_flag) {
case COAP_GET:
/* write the response buffer with the internal value */
p += fmt_u32_dec(rsp, internal_value);
code = COAP_CODE_205;
break;
case COAP_PUT:
case COAP_POST:
{
/* convert the payload to an integer and update the internal value */
char payload[16] = { 0 };
memcpy(payload, (char*)pkt->payload, pkt->payload_len);
internal_value = strtol(payload, NULL, 10);
code = COAP_CODE_CHANGED;
}
}
return coap_reply_simple(pkt, code, buf, len,
COAP_FORMAT_TEXT, (uint8_t*)rsp, p);
}
/* must be sorted by path (alphabetically) */
const coap_resource_t coap_resources[] = {
COAP_WELL_KNOWN_CORE_DEFAULT_HANDLER,
{ "/riot/board", COAP_GET, _riot_board_handler },
{ "/riot/value", COAP_GET | COAP_PUT | COAP_POST, _riot_value_handler },
};
const unsigned coap_resources_numof = sizeof(coap_resources) / sizeof(coap_resources[0]);